Best available copi



Patented Nov. 22, 1921.

6 SHEETSSHEET I. 2&-

.Doam" SE3? AVAELJ RBL'E 9 3 5 1 F. H. DOERR.

COMPUTING MACHINE.

APPLICATION men MAR. 16. 1911.

1,398,068. Patenwd Nov. 22, 1921.

6 SHEETS-SHEET 3- 2 Fig-4] lFradl-Lboarr Ea Afiovngygs.

F. H. DOERR.

COMPUTING MACHINE.

APPLICATION men MAR-16.1912.

Patented Nov. 22,1921.

' 6 $HEETSSHEET 4.

37 E i 6 j? \5 6.9 2559 /6 A5 I F. H. DOERR.

COMPUTING MACHINE.

APPLICATION FILED MAR. I-6.. L9H.

1,398,068. Patented Nov. 22, 1921.

6 SHEETSSHEET 5.

BEST AV F. H. DOERR. COMPUTING MACHINE.

APPLICATION FILED MAR. 16. 1917. 1,398,068. Patented Nov. 22, 1921.

l I llz 7 "r l a; a2 2 22 15 14 I5 719 A5 9 I 3 l8 A35 l8 [8 2 22 2 2/ 22 2 22 l I' III m- 5 25 34 fig-ILL? 2a Inucmo r- Lgr gdliDoavr QMM WW- AII Qvnegs.

umrsn STATES:

sA'rENr QFFiCE FRED H. DOERR,

coMrU'rmG-Macnn n;

concern: v, l3e it lmO\VI1 th2Lt'1,'IRED H. Dori-nu, a c trzen ofithe United States of America 'residing at Grand Rapids, in t-he county of Kent and State of Michigamhave invented certain new and useful "Improvements" Computing-Machines; and do hereby declare the following to. be 'ai' fu'll, clear, exact description of th e invention,"s icli as will enable others skilled int-he art to which it appertains to make "and use thesame.

Thisinvention relates to a computing ma chine upon which various computingopera-1 tions such 'as addition, subtraction, multiple cation and'division may be performed' an'd the result indicated by the machine tor' eady observation. It is aprimary objectandp ur-i pose otmy inventionito make a niachinejof this character which while of co mpac t.and

comparatively simple con'stmcion shall .be accurate and exactin operation .and at the;

sametime durable and efficient and substan tially proof .againstgetting out of order.

A further feature of the invention coiisists' in the provision of novel mechanism for clearingfthe machine either wholly or? in part together with Jan especially novel and effectivefcarrying mechanism; A still further feature of the invention consists in a novel mechanism for insurance against any overmovenient of the parts of the mechanism beyond that desired by the operator under the momentum given them when operated. Many other objects and purposes not specifically enumerated together with novel mechanisms for attaining the same will he apparent from the following description taken in connection with the accompanying drawings which show a practical and operative embodiment of the invention and in which;

Figure 1 is a plan View of the machine.

Fig. 2 is a vertical section taken substantially upon the line 2 2 of Fig. 1, and showing the mechanism in side elevation in normal cleared position.

Fig. 3 is a fragmentary side elevation of the upper rear part of the machine the corering casing therefonbeing removed.

Fig. 4 is a view similar to Fig. 2 of the front portion of the mechanism of the machine with parts brokenaway to better disclose the same, illustrating the position of the parts when an operating .member has been moved substantiall to: the limit of its travel in a downward direction;

or GRAND Harms, iuicmew, ASSIGNOB, BYMESNE AssiGNMEN'rs 'ro w rtm ii 1). BLEICK, or NEWARK, NEW JERSEY.

Specification of Letters Ifatent Nbv. A' biifioii filed Harch16,1 917. $455,231. {I

Fig.5 is aviewsim lar'to-lii .4 de ths of thekm'ech' nism showii in rig been moved an additional step."

- Fig. is is a'yiewsimilafto rig". 2 0mm mror clearing partbfthenie lranisIrEbftheZ 6o machine illustrating or first we the; I

clearing operation,

from the side of piie f of the computiiig units and associated mechaiiis'ii 'bpposite to that shownin Fig. 8. f 1 f]; Like reference characters refer toj'lilte parts throughout the se yeinl {viewsfof the drawings. I z'icji' 1;},- F775: The mechanism of the machine which I have invented is located above a base 1 and is practieallyinclosed byan outer casing har ing sides 2, aback 3 and a horiio ntal top '4! extending from' theiear over substantially one-half of the machine. The casingalso ineludes a vertical front side 5 substantially one-half of the height rot the-re ar side 3 turned inwardly at its upper edge to provide a horizontal ledge 63. The top section 4 is curved downwardly at its front in the are of acircle as indicatedat 7: and the case is completed by an arcuate section 8,'having a relatively large radius of curvature, integral with and connecting the rear of the ledge 6 with the lower part of section 7 'Aiiumbe'r of openings '9 ar'e inade in section Tof'the casing 1 backfof which are indicatingdisks 10, loosely mounted upon aitransverse shaft 11. Shaft 11 at its ends is carried by vertical spaced apart plates 2? located immedi ately within and paralleling the-sidesQ 'of the housing or casing, it being designed that the mechanismishall becarried entirely on 5 a supporting frame comprised of pieces 2 and the base l-and'tliat the housing or 'easing- AVAILABLE se may, if desired, be removed for access to the mechanism.

The indicating disks 10 may he of anyJdesired number depending upon'the number of rows or columns of figures which the inachine is designed to handle. Around each disk a plurality of figures are printed and evenly spaced from each other rangingfrom O to 9 in consecutive order. A. pinion 12 having ten teeth is secured at the side of each disk and is movable therewith.

The curved section 8 of the casing is provided with a plurality ofvertical slots 13 below the openings 9.. Through each oftsaid slots an operatingquadrant 16 projects it being loosely mounted upon .a hub 15 which.

in turn is loosely mounted upona horizontal shaft 16. There isnone of these. quadrants and hubs for each of the indicating disks 10 and all ofthe hubs are loosely mounted upon the shaft16 covering nearly the full length thereof, the ,end hubs being spaced from the vertical supports 2 ,by v.suita blte. A eseries of" spaced projections 17 are formed at the collars .as shown in Fig. 11.

outer curved edge ,of. ,each quadrant, any space .between any two projections :being adapted to receivethe finger of the operator. Each quadrant is provided with nine ,of

these spaces. An al m .18- is, formed integral with each quadrant and project-shelow, the.

pivotal mount therefor. A coil ,spring .19 is secured at one end of each arni all of the springs having connection at their other ends to a transverse rod20. The tendency t' the springs is to hold the quadrants in upper position as shown in Fig. 2 and whenever free to do so the operating quadrants return to such position. v

Associated with each quadrant and secured to each bushing at the right hand end thereof is a ratchet wheel 21 provided with forty teeth around its circumference. A year wheel 22'also having forty teeth is located alongside the ratchet wheel ar ranged between it and its associated quadrant 14. Wheels 22 are in mesh with the pinions 12. A hook 23 is pivotally connccted to each quadrant 11 and located soas to connect with. the associated ratchet wheel 21. Normally in the upper position of .the quadrants the inclined rear ends of the hooks bear against the inclined side of a horizontal bar 24- laying above the ratchet and gear wheels. A. spring 25 connectedio each hook and an arm of a quadrant, asshown in Fig. 12, has a normal tendency to draw the hook into engagement with the associated ratchet wheel as soon as downward movement of said quadrant is begun and carried out sufficiently to move the hook away from the bar 24.

To the left of each operating quadrant of the machine on thesection S of the casing, a vertical row of figures, indicated at 25, it?

printed reading upwardly from 1 to 9 in 7 consecutive order. The figures are properly located to correspond with and number the finger spaces in the quadrants. In addition ..,to the right hand quadrant a vertical row below it ina downward directionthe full distance which it can tr'avelafter the finger of the operator has been engaged with one of the notches therein, indicates the same figure through theopening 9 that was to the left of the'notch engaged by the finger of the operator; and if'previous to said operation, the indicating disk shows any other figure than zero, after the operation said disk willshow anumber-which is the sum of the'figure that wasfirst shown plus the number opposite the notch'engaged by the "finger of the operator. It, of course is understood that if the sum of jthetwo figures is more than nine, the,indicating'disk associated with the quadrant operated will show only the second figure of said sum.

When a quadrant is engaged by, the finger of the operator in any notch therleof'it may be moved downwardly until the finger en-' gages with the ledge 64 I have provided mechanism to lock and prevent any overthrow of the ratchet wheel 21 and associated parts beyond the point to which it is operated. A horizontal rod 27 is intei'posed between the sides 2" at the lower front part of the machine on which a plurality of bell crank levers are mounted one for each gear 22. The rearwardly extending arm 28 of each lever has an upturned hook 29 adapted to one position to engage between successive teeth on its associated gear wheel. To the forward arm 30 of each bell crank lever a bar 31 pivotally connects, at its upper end, carrying a head32 which in normal position projects slightly above ledge 6. A coil spring 33 under tension connecting to the arm of 'each bell crank [lever normally holds the arm 28 in lower position so that it rests upon the horizontal bar 34 belownit and raises the head 32 above ledge 6. In the operation of any quadrant the finger, before it can get to the ledge (3, engages the head 32 underneath and depresses the same and, as shown in Fig. 8, elevates the hook'29 so that it passes between two of the teeth of the gear 22. The gear and quadrant are so designed that whenever the finger of an op erator in a notch of a quadrant bears against stopping any tendency of the gear or any of its associated parts to pass, under the momentumthereto in operation. beyond the point desired.

Each hub 15 at the end opposite to that on which the ratchet wheel 21 is connected carries a cam member 35 which lies alongside the ratchet wheel on the adjacent bushing to the left. The member 35 is provided with four cams 36 each bounded by an outer curved cam surface 37 and a side or shoulder 38 as shown,'the outer ends of sides 37 and 38 coming to a point. The cam surface 37 at one end is located nearer the bushing 15 than at the other and is curved with a progressingly increasing radius of curvature to the point where it meets theishoulder38, there being what may be termed deep notches in each member 35 as shown. Back of and below members 35, a transverse shaft 39 is located on which a plurality of dogs 40.are loosely mounted. The pivotal mount of said dogs is between the ends thereof and each has a downwardlyextending arm'fwith which the forward end of a; coiled spring ,41 is connected, all of said springs at their rear ends having connection to a transverse rod 42. The springs causethe upper end of dogs 40 to bear against the surfaces of the associated cam members35. Each dog 4O, above the shaft 39, carries a pivotally mountedbell crank lever, including an upwardly extending arm or dog 43 and a rearwardly extending arm 44. Above the shaft 39 a second transverse shaft 45 is located on which dogs 46. are pivotally mounted between the ends thereof. There is a dog 46 for each ratchet wheel 21 mountedin the same vertical plane therewith. 'Acoil spring 47 is connected at its upper end to each dog 46 at a point in front of the shaft 45, at its lower end connecting to the arm 44 of the bell crank lever directly below it. The influence of the spring normally engages dog 46 with the teeth of the adjacent ratchet .,wheel to the left andat the same time throws the arm 43 forward into engagement with the same ratchet wheel. p

When an indicating disk 10 stands at zero the dog 40 associated with thesame computing unit seats in one of the notches in the member 35 and against one of the shoulders 38 as indicated in Fig. 2.. With the operation of the associated quadrant, cam member 35 is turned and dog 40 at its upper end is moved to the rear over one of the cam surfaces 37 passing farther along. said surface and farther to the rear as the indicating character onthe disk 10 increases in amount. In Fig. 4 the disk 10 is at the position where the figure 9 shows through the opening 9 in the casing. In Fig. 5 it will be noted one additional step has been given to the unit such that the zero character willappear on disk 10. back of said 5E8? AVA? ii 53 opening 9. iVhen this occurs the upper end of the dog 40 passes the point of the cam 36 and drops into the notch behind the succeeding shoulder 38. Referring again to Fig. 4, it will be noted that thearm 43 engaging with the ratchet wheel 21 on the unit to the left, has in Fig. 5, moved upwardly with the forward movement of dog 40 to turn said ratchetwwheel one step or space, the part being so designed-as to effect this turning movement. -Accordingly, when, in the process of addition, the mechanism for any disk reaches a point such that the addition of another number increases the sum to more than 9 and requires carry ing into the column to the left, such carrying is automatically effected by'the inward movement of the upper end of the dog 40 .as it drops behind the point of a cam 36-and the upward thrust imparted thereby i to the bell crank lever arm43 whichrisengaged with the ratchet wheel for the next higher column tothe left. jlnasmuchas the roomputing mechanisms for each column-are duplicates, the carrying operation-in all cases to the next higher column is identically the same. It will be noted that:;the pressure of the upper end of dog 40.on-.the cam surface 37 has a tendency to rotate the cam member 35 in fa'backward'flirection, this being normally checked and: controlled by the engagement, of the upper dog -46. with the ratchet wheel-21. 1 a if" n The mechanism for, clearing-the machine either wholly or any column thereof will now be described. Aiclearing-bar48 is positioned back of and associated-with each computing unit of the machine, all 7 of the bars being vertical -'and-.- slidably 'mounted in upper and lower transverse plates 49 and-5O and extending at their upper'ends through the top 4 of the case. A coilspring .51- connected to each bar and the upper:plater49 holds them normally in upper position with a stop 52 on each 'bar engagingagainst the under-side ofthe upper plate 49. An operating head 53 is fixed to the upper end of each of the bars 48 for use in manually'depressing'the same. Upper and lower'pins 54 and 55 project laterally in opposite directions fromeach of the bars 48 whereby, on depression of any bar, saidpins engage, respectively, with the rear end of the dog 46 associated with the ratchet wheel of the computing unit with which bar 48 is associated, and with the rear arm 44 ofabell crank lever the .other arm ofwhich bears against the ratchet wheel 21 of the computing unit to the left... There is also athird pin 55 on each bar 48 directly backfof pin 55 and extendingin the opposite direction over an arm 44 of the lever which engages with the same ratchet wheel 21 with which said dog 46 engages. Each bar in its rear edge and a short distance below its upper end is provided with a2notcht5'6 which, when a :bar 'hasbeen ipartiall-y depressed, .as indicated Fig. 6-, adapts it to be turned slightly :torthe .rear to engage with the =upper plate-49. i'lt'willzbe noted in this connection that --wLhen depressed this amount pins 55 55 engage with theirirespective bell crank arms 44 but "that pin *54' does-"not yet come into contact engagement its dog-:46. Normally each vloar 48 on depression and :release returns: to upper position, its mp per end being .forward by spring :57 connected thereto andtoza-tcod 58.

--On:a:tr2msvense rodz59 ;a :plurality of ir-' regularly -shaped zme'mhers 60 are pivotally mounted.- A s':shown,-'said \membets bend to thezrearnfartm distance below 'theapivot and thence extenld substantially straight downiat their ulower ends curving; forward tog "make arms-v61 each of 'whichtat-Lite 811d. liS pivotally: oonne'cted to :a member 62looselyunou'nt ed upo'nza rod=6 3. A kicker 64ipasses=loosely at its :rear: end z through an: opening .in: the upper end ro'f each :member 62- i and its front endnpasseshthrou'gh an elongated werti'Cal'.'S10t in a vertically positioned plate 66' which :is filo'cated below-and back ofirthe coinputin "units. "The'kick ers 64 are in the same vertical planes .withthe gears 221- The rear end ofeach kicker 64 isshaped into a rod and screw threaded :to 'recei v-e an adjusting 'nut and a 67* is rconnectediit'o' said rear end and to the arm 6 1 0f the member with which it'iis associated; P'Ooil} are attached at their upper ends to plate 49 and at their lower:ends one to each member 60' to the march-odes); thereby' tuming said members 60 and "62' tq their-ear until stopped by the' engagement of the forward end" of kickers 64 withplatefiG as shown in Fig- 2. A: strong' 'spring "69 is interposed between and connects each clearing bar'48 and eachmember; 60". F' 5 i I 1 When it"is desired'to {clear a computing unit the "associated 'clearin g' bar 48 is depressed whereupon spring 69, being stronger than spring 68', turns the-member 60 forward about itspivot until the front endof the kicker 64 engages with a tooth of the gear -22i- This happens practically as soon as or very shortly after the initiation of the downwardmovement of the bar '48. The next operation is the engagement of pin 55 with the arm 44 of the bell crank lever freeing its dog 43 from the ratchetwheel 21 the ratchet;wheel 21 of the computing unit to the'l'eft being also freed of its dog 43 through pin'i55'; and finally ,pin 54 engages with the rear end of dog, 46 disengaging the-dog from the ratchet wheelof the unit. which is to be cleared. ,Inf'the meantime, it will be observed, the end of, the kicker 64 has been forced against thegear wheel22 and the pressure .has been continuously increasing due to the fact that spring 69 has been conaces tinually stretched so that by the time :dog 46 is disen aged from ratchet wheel 21 the spring 69 has stored up a relatively large amount of-energy to impart to the kicker as soonas-dog46 is disengageds: VVhen'this occursa the'kicker is projected forward under theimpulse given ibyuspring 69 .and imparts aaotarymovementdo thegear :22 in a reverse direction whereupon I this-gear and all the parts associated and movable therewith rotate in a reverse direction until the dog 40 engages with :a shoulder 38 on cam member 35, stopping the computing unit with the zero character- 'on the indicating :disk 10 showing. 'It will be-noted that the connection of the kicker F64 to the member 62 is a loose oneand thatxith'e kicker is provided with an inclined surface 7 0 directly in front of the upper endof said member 62 so designed that after the impulse has been given to ''gear wheel 22, the kicker; is disengaged therefrom and-moved to; =a lower= posi tion as shown'in;F'ig.'='7;

ii To gclear' the entire mathine all of the clearing birrs48 may=be manually depressed in unison hut 'in practice it is better to have asingle device for attaining this end. Accord-ingly,' on a shaft 71 in the upper-rear portion of -the machine have mounted a plurality of: forwardly projecting fingers 7 2 one "of whichcomes over 'e'ach pin 54. An arm 7 3 dependsfrom one end'ofshaft 71 and a bell crank lever is pivotally connected by me'ansof aiscrew 74 to thef'same end of the shaft '15'3'o'n'the outside of'one of the supporting'sidesfi of the machine.

"'-The bell crank lever includes a downwardlyprojecting arm' 75 whichiis connected to'the lower-end of the arm '7 8 by a link 76. In practice'a pin77 connects the rear end of the link with'the lower end of arm 73 and is movable back and forth'through a head 7 8 in the side 2*; The operating lever also includes an upwardly and forwardly ext'ending ari'n 79 provided at its free end with a head 80 for manual operation. Said arm 7 9 extends through a slot 81 in the housing or casing of themachine. It is clear that by depressing the head .80-the forward ends of all 'oflthe'fingers 17 2 are moved downwardly thereby depressing all of the clearing bars 48 in unison and affecting the complete clearing of the machine. Y

Witha machine constructed as described the operation of adding is very simple All that is necessary is to place the fingers of the operator in the notches of the operating quadrants opposite the figures of columns 26 correspbnding .to the number to be added and move said quadrants 4 down until the fingers are stopped by the ledge 6. For instance; if to any number appearing on the disks itisdesir ed to add any number, such @5253, the operator' places one finger opposite the'figu re 2 in the third or hundreds opcrating quadrant, another in the notch opposite 5 in the second or tens quadrant and another in the notch opposite 3 in the first or units quadrant and the indicating disks 10 after the quadrants 'have been operated with the fingers in such notches will show the sum through openings 9.

By means of this machine subtraction may also be accomplished. The operation can best be described by a concrete example. For instance, suppose that 387 is to be taken away from the number indicated in Fig. 1. The first operation is'to depress the fourth clearing bar from the right, or the one associated with" the'thousand' column, to the point shown in Fig. 6 and hold it :in such'positiomthe bar-being forced slightly to the rear so that its notch receives the plate 49. This will prevent carrying to said thousands column. The next operation is to engage the" operating quadrant for d the hundreds column'at the space directly opposite the figure 3-inthe column 26 and operates said quadrant until the finger is stopped by the ledge 6. The finger is then engaged with the operating quadrant-for the tens column at the place opposite the figure,=8 in column 26 this quadrant being operated in the same manner, And finally the finger is engaged with "the-2 space in the units quadrant the space opposite the figure 8' or column 26* or in a spa'ce-one below that oftheunits to'be subtracted. The

clearing bar for the thousand column is thenreleased and the remainder is shown by the disks through the openings 9." This method of subtraction is substantially the same'as in many other typesof so called adding machines'which, in reality, are capable of various computations besides add ing. As multiplication is a series of additions it is obvious that the same can be readily performed on this machine, and, in the same-way, division-being a series of sub tractions the machine may also be used for accomplishing the same.

-A machine of the character described is very compact and; may be readily carried. It is substantially-fool proof being efiectually guarded from over throw or reverse movements of parts ofjthe mechanism ex cept when desired. On this'machine practically everything can be accomplished that is accomplished on any of the larger machines except the recording of results obtained. The :greatertportion of the mechanism consist of stampings and many parts are duplicates whereby it may be economically manufactured. v I

Many changes in constructive detail may be resorted to without departing from my invention and I accordingly do not consider my invention as limited to the specific disclosure made but consider myself entitled to all modifications of structure falling with- BEST G g? in the scope of the appended claims defining the invention.

I claim 1. In a computing machine, a casing provided with a plurality of spaced horizontal openings in the top thereof and with vertical slots below each opening, a horizontal ledge to the casing below said slots, an indicating disk rotatably mounted back of each opening in the casing, an oscillatory operating quadrant rotatably mounted inside of the casing-and extending through each slot, mechanism connecting each quadrant and a disk for turning the disk on operation of the quadrant in a downward direction,

.means yieldingly holding each quadrant in upperposition, and meansfor operatively engaging each quadrant at a plurality of points on its outer surface.

In a computing machine, a computing unit comprising a rotatably mounted hub, a ratchet wheel secured to one end of the hub and yieldably urged in one direction, a gear wheel located along side of and movable with the ratchet wheel, an operating quadrant loosely mounted on the hub, alongside the gear wheel, a springactuated hook on said quadrant to engage with the teeth of the ratchet wheel, an indicating disk rotatablymounted back of and above said gear Wheel and. a pinion secured to the disk and meshing with the gear wheel.

3. In a computing machine, a computing unit comprising a rotatably mounted hub, aiatchet wheel secured a tone end of the hub, an operating quadrant loosely mounted on the hub and yieldably urged in one direction, a spring actuated hook on the quad rant to engage with .the ratchet wheel, to turn the same on operation of the quadrant in, one direction, an indicating disk rotatably mounted back of and above the hub and ratchet wheel, and connections between the ratchet wheel and indicating disk for turning the disk. simultaneously with the turning of said ratchet wheel.

' 4. In a computing machine, a computing unit comprising a rotatably mounted hub, an oscillatory operating quadrant loosely mounted thereon, having peripheral operating means arranged at intervals, an indicating disk rotatably mounted above and back of the hub, and mechanism connecting said quadrant and disk for turning the disk predetermined amounts on operation of the quadrant.

5. In a computing machine, acovering casing. a plurality of computing units located in alinement within the casing, each including a rotatably mounted hub, an operating quadrant loosely mounted on each hub and projecting through a slot in the front of the casing, said quadrants being adapted for engagement by the fingers for operation in a downward direction, means yieldingly holding the quadrants inupper position, a gear fixed on each hub, a ratchet wheel positioned alongside each gear and movable therewith, an indicating diskdriven by each gear, a spring actuating hook on each quadrant for engagement with the ratchet wheel on the same hub, and a horizontal ledge to the casing below the slots in the casing.

6. In a computing machine, a covering casing having a forwardly and downwardly [:urved front side and a horizontal ledge below said side, said side and ledge being provided with communicating transverse slots, a plurality of computing units positioned in alinement inside the casing, each including a rotatably mounted hub, an oper ating quadrant loosely mounted on each hub and extending through said slots in the easing, means arranged at intervals on the outer edge of each quadrant adapted for engagement by the fingers of an operator, a gear on each hub, means for transmitting motion from the quadrants to the gears, an indicating disk driven-by each gear, a lever pivl otally mounted below, and in front of each gear, a hook at the rear end of each lever adapted to engage between teeth of a gear, means normally holding the hooks out of engagement with the gears, and an operating member for each leverhaving a head extendingupwardly through the: ledgedirectly in front ofeach quadrant.

7. In a computing machinea plurality of complementary units mounted in'alinement, each including a rotary hub, an oscillatory operating quadrant loosely mounted on the hub and provided at intervals with operating means, a ratchet wheel and gear located at and secured to one end of the hub, a cam member fixed to the opposite end of the hub and provided at intervals with shoulders and having cam surfaces between the shoulders, means carried by the quadrant for operating said ratchet wheel, a spring actuated dog engaging said cam memher, and means forreleasing the dog therefrom. l

8. In a computing machine, a shaft. a plurality of hubs positioned end to end. and loosely mounted on the shaft, a ratchet wheel fixed at one end of each hub, a gear secured to each hub beside the ratchet wheel. an operating quadrant loosely mounted on each hub alongside each gear, a hook on each quadrant adapted to engage with. the associated ratchet wheel and turn it in one direction on operation of the quadrant, an indicating disk driven by each gear, a cam member secured .to the opposite end of each hub and adjacent the ratchetwheel on the adjacent hub, said cam member having a plurality of cam surfaces disposed between shoulders on said member, a spring actuated dogbearing against the edge: of each cam member, a hell crank lever pivotally mounted on each dog and having an arm engaged with the ratchet wheel on the adj acent bushing, and a separate dog for each; ratchet wheel normally preventing backward rotary movement of a ratchet wheel and attached mechanism. v Y

9. In a computing machine a horizontal shaft, a plurality ofcomputi-ng units placed end to end and loosely -mo unted ion the shaft each comprising a hub, aratchet wheel secured at one end of each hub, a cam member secured at the opposite-end of each hub and closely adjacent the ratchet wheel on the adjacent hub, said? cam member having a plurality of cam surfaces disposed between equally spaced shoulderson'sa-id cam memlber, means tooperate each-hub and. attached ratchet wheel and cam member in one direction, a dog engaged with each ratchet wheel to prevent movement in: the oppositedirem tion, a vertically positioned spring actuated dog back of andbearingagainst the cam surfacesvo'feach cam member, aabell crank lever pivotally mounted on each of saidlast mentioned dogs, one armthereof engaging with the teeth of the ratchet=wheel of the adjacentcomputingunit, andJ-a spring-connecting' the other armof said lever and ratchet. engagingdog. 1 I

10. In a-computing machine, a horizontal supporting-shaft, a plurality 0t hubs loosely mounted in alinement on'the shatt, alratchet wheel having forty teeth fixed-at theright hand end ofeach hub, a-i gear Wheel having forty teeth located beside: and rotatablewith each ratchet wheel, an operating quadrant loosely mounted on each hub and provided with equally spaced. projections on, its outer edge to form nine finger spaces between the projections, means for connecting it with the-ratchet wheel, a-n': indicating disk rotatably mounted above each ratchet and gear wheel, a pinion of ten te'ethconnected: to each disk and meshingwithe gear wheel, equally spaced figures fI'OH'lr jzero'to nineconsecutively printed; around each-disk, a cam member fixed to the-left endof each hub, provided'withfour equally spaced substan tially radial shoulders, four cam surfaces disposed between the shoulders, a large dog pivotally mounted: between" its, ends below the shaft, back of each oa-m member, a spring forcing the upper'en'dof each dog against a cam member, and, a spring actuated arm pivotally. mounted on each" dogand engaging with; the ratchet wheel" fixed-om the adjacent hub to the left, substantially as described.

l-l. a computing machine, a horizontal supporting-shaft, a plurality of-hubsdoosely mounted in a-linemen't on the shaft a: ratchet wheel ofr fortyteeth fixed at theright' end of eachhub, argear' wheel, of; fonty -teethbe side. each} ratchet wheel and movable there with, an operating quadrant having nine equally spaced finger spaces in its outer edge loosely mounted on each hub, a hook on each quadrant for connection to the associated ratchet wheel, a disk rotatably mounted above each hub, indicating figures from zero to nine in equally spaced and consecutive order on the surface of the disk, a pinion of ten teeth on each disk meshing with a gear wheel, and means for moving a hub at the left one-fortieth of a revolution on movement of the hub at its right one-quarter of a revolution, substantially as described.

12. A computin machine including a rotary indicating isk, an oscillatory operating segment, means for yieldably urging the oscillatory operating segment in one direction, and means for transmitting motion from the oscillatory segment to the indicating disk. Y

18. A computing machine including an indicating disk, a ratchet wheel, gearing for transmitting motion from the ratchet wheel to the indicating disk, an oscillatory oscillating segment, and a pawl or dog carried by the segment for engaging the ratchet wheel to turn the same.

14. A computing machine including an indicating disk, a ratchet wheel, gearing for transmitting motion from the ratchet wheel to the indicating disk, an oscillatory operating segment, a sprin connected with the segment for urging the same in one direction, and a pawl or dog carried by the segment and arranged to engage the ratchet wheel to engage the same when the segment is operated.

In testimony whereof I afiix my signature.

FRED H. DOERR. 

